erosions

noun

1. 1.The result of having been worn away or eroded, as by a glacier on rock or the sea on a cliff face.
2. 2.The changing of a surface by mechanical action, friction, thermal expansion contraction, or impact.
3. 3.The gradual loss of something as a result of an ongoing process.
4. 4.Destruction by abrasive action of fluids.
5. 5.(image processing) One of two fundamental operations in morphological image processing from which all other morphological operations are derived.